vfs/fish.c

   1 /* Virtual File System: FISH implementation for transfering files over
   2    shell connections.
   3
   4    Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
   5    2007 Free Software Foundation, Inc.
   6
   7    Written by: 1998 Pavel Machek
   8    Spaces fix: 2000 Michal Svec
   9
  10    Derived from ftpfs.c.
  11
  12    This program is free software; you can redistribute it and/or
  13    modify it under the terms of the GNU Library General Public License
  14    as published by the Free Software Foundation; either version 2 of
  15    the License, or (at your option) any later version.
  16
  17    This program is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU Library General Public License for more details.
  21
  22    You should have received a copy of the GNU Library General Public
  23    License along with this program; if not, write to the Free Software
  24    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  25
  26 /**
  27  * \file
  28  * \brief Source: Virtual File System: FISH implementation for transfering files over
  29  * shell connections
  30  * \author Pavel Machek
  31  * \author Michal Svec
  32  * \date 1998, 2000
  33  *
  34  * Derived from ftpfs.c
  35  * Read README.fish for protocol specification.
  36  *
  37  * Syntax of path is: /#sh:user@host[:Cr]/path
  38  *      where C means you want compressed connection,
  39  *      and r means you want to use rsh
  40  *
  41  * Namespace: fish_vfs_ops exported.
  42  */
  43
  44 /* Define this if your ssh can take -I option */
  45
  46 #include <config.h>
  47 #include <errno.h>
  48 #include <fcntl.h>
  49 #include <pwd.h>
  50 #include <grp.h>
  51 #include <sys/time.h>           /* gettimeofday() */
  52 #include <stdlib.h>
  53 #include <string.h>
  54
  55 #include "../src/global.h"
  56
  57 #include "../src/tty/tty.h"     /* enable/disable interrupt key */
  58
  59 #include "../src/wtools.h"      /* message() */
  60 #include "../src/main.h"        /* print_vfs_message */
  61 #include "../src/util.h"
  62 #include "../src/strescape.h"
  63 #include "../src/unixcompat.h"
  64 #include "../src/fs.h"
  65 #include "utilvfs.h"
  66 #include "xdirentry.h"
  67 #include "vfs.h"
  68 #include "vfs-impl.h"
  69 #include "gc.h"         /* vfs_stamp_create */
  70 #include "tcputil.h"
  71 #include "fish.h"
  72
  73 int fish_directory_timeout = 900;
  74
  75 #define DO_RESOLVE_SYMLINK 1
  76 #define DO_OPEN            2
  77 #define DO_FREE_RESOURCE   4
  78
  79 #define FISH_FLAG_COMPRESSED 1
  80 #define FISH_FLAG_RSH        2
  81
  82 #define OPT_FLUSH        1
  83 #define OPT_IGNORE_ERROR 2
  84
  85 /*
  86  * Reply codes.
  87  */
  88 #define PRELIM          1       /* positive preliminary */
  89 #define COMPLETE        2       /* positive completion */
  90 #define CONTINUE        3       /* positive intermediate */
  91 #define TRANSIENT       4       /* transient negative completion */
  92 #define ERROR           5       /* permanent negative completion */
  93
  94 /* command wait_flag: */
  95 #define NONE        0x00
  96 #define WAIT_REPLY  0x01
  97 #define WANT_STRING 0x02
  98 static char reply_str [80];
  99
 100 static struct vfs_class vfs_fish_ops;
 101
 102 static int
 103  fish_command (struct vfs_class *me, struct vfs_s_super *super,
 104                int wait_reply, const char *fmt, ...)
 105     __attribute__ ((format (__printf__, 4, 5)));
 106
 107 static int fish_decode_reply (char *s, int was_garbage)
 108 {
 109     int code;
 110     if (!sscanf(s, "%d", &code)) {
 111         code = 500;
 112         return 5;
 113     }
 114     if (code<100) return was_garbage ? ERROR : (!code ? COMPLETE : PRELIM);
 115     return code / 100;
 116 }
 117
 118 /* Returns a reply code, check /usr/include/arpa/ftp.h for possible values */
 119 static int fish_get_reply (struct vfs_class *me, int sock, char *string_buf, int string_len)
 120 {
 121     char answer[1024];
 122     int was_garbage = 0;
 123
 124     for (;;) {
 125         if (!vfs_s_get_line(me, sock, answer, sizeof(answer), '\n')) {
 126             if (string_buf)
 127                 *string_buf = 0;
 128             return 4;
 129         }
 130
 131         if (strncmp(answer, "### ", 4)) {
 132             was_garbage = 1;
 133             if (string_buf)
 134                 g_strlcpy(string_buf, answer, string_len);
 135         } else return fish_decode_reply(answer+4, was_garbage);
 136     }
 137 }
 138
 139 #define SUP super->u.fish
 140
 141 static int
 142 fish_command (struct vfs_class *me, struct vfs_s_super *super,
 143               int wait_reply, const char *fmt, ...)
 144 {
 145     va_list ap;
 146     char *str;
 147     int status;
 148     FILE *logfile = MEDATA->logfile;
 149
 150     va_start (ap, fmt);
 151
 152     str = g_strdup_vprintf (fmt, ap);
 153     va_end (ap);
 154
 155     if (logfile) {
 156         fwrite (str, strlen (str), 1, logfile);
 157         fflush (logfile);
 158     }
 159
 160     tty_enable_interrupt_key ();
 161
 162     status = write (SUP.sockw, str, strlen (str));
 163     g_free (str);
 164
 165     tty_disable_interrupt_key ();
 166     if (status < 0)
 167         return TRANSIENT;
 168
 169     if (wait_reply)
 170         return fish_get_reply (me, SUP.sockr,
 171                                (wait_reply & WANT_STRING) ? reply_str :
 172                                NULL, sizeof (reply_str) - 1);
 173     return COMPLETE;
 174 }
 175
 176 static void
 177 fish_free_archive (struct vfs_class *me, struct vfs_s_super *super)
 178 {
 179     if ((SUP.sockw != -1) || (SUP.sockr != -1)) {
 180         print_vfs_message (_("fish: Disconnecting from %s"),
 181                            super->name ? super->name : "???");
 182         fish_command (me, super, NONE, "#BYE\nexit\n");
 183         close (SUP.sockw);
 184         close (SUP.sockr);
 185         SUP.sockw = SUP.sockr = -1;
 186     }
 187     g_free (SUP.host);
 188     g_free (SUP.user);
 189     g_free (SUP.cwdir);
 190     g_free (SUP.password);
 191 }
 192
 193 static void
 194 fish_pipeopen(struct vfs_s_super *super, const char *path, const char *argv[])
 195 {
 196     int fileset1[2], fileset2[2];
 197     int res;
 198
 199     if ((pipe(fileset1)<0) || (pipe(fileset2)<0))
 200         vfs_die("Cannot pipe(): %m.");
 201
 202     if ((res = fork())) {
 203         if (res<0) vfs_die("Cannot fork(): %m.");
 204         /* We are the parent */
 205         close(fileset1[0]);
 206         SUP.sockw = fileset1[1];
 207         close(fileset2[1]);
 208         SUP.sockr = fileset2[0];
 209     } else {
 210         close(0);
 211         dup(fileset1[0]);
 212         close(fileset1[0]); close(fileset1[1]);
 213         close(1); close(2);
 214         dup(fileset2[1]);
 215         /* stderr to /dev/null */
 216         open ("/dev/null", O_WRONLY);
 217         close(fileset2[0]); close(fileset2[1]);
 218         execvp(path, const_cast(char **, argv));
 219         _exit(3);
 220     }
 221 }
 222
 223 /* The returned directory should always contain a trailing slash */
 224 static char *fish_getcwd(struct vfs_class *me, struct vfs_s_super *super)
 225 {
 226     if (fish_command (me, super, WANT_STRING, "#PWD\npwd; echo '### 200'\n") == COMPLETE)
 227         return  g_strconcat (reply_str, "/", (char *) NULL);
 228     ERRNOR (EIO, NULL);
 229 }
 230
 231 static int
 232 fish_open_archive_int (struct vfs_class *me, struct vfs_s_super *super)
 233 {
 234     {
 235         char gbuf[10];
 236         const char *argv[10];   /* All of 10 is used now */
 237         const char *xsh = (SUP.flags == FISH_FLAG_RSH ? "rsh" : "ssh");
 238         int i = 0;
 239
 240         argv[i++] = xsh;
 241         if (SUP.flags == FISH_FLAG_COMPRESSED)
 242             argv[i++] = "-C";
 243
 244         if (SUP.flags > FISH_FLAG_RSH)
 245         {
 246             argv[i++] = "-p";
 247             g_snprintf (gbuf, sizeof (gbuf), "%d", SUP.flags);
 248             argv[i++] = gbuf;
 249         }
 250
 251         argv[i++] = "-l";
 252         argv[i++] = SUP.user;
 253         argv[i++] = SUP.host;
 254         argv[i++] = "echo FISH:; /bin/sh";
 255         argv[i++] = NULL;
 256
 257         fish_pipeopen (super, xsh, argv);
 258     }
 259     {
 260         char answer[2048];
 261         print_vfs_message (_("fish: Waiting for initial line..."));
 262         if (!vfs_s_get_line (me, SUP.sockr, answer, sizeof (answer), ':'))
 263             ERRNOR (E_PROTO, -1);
 264         print_vfs_message ("%s", answer);
 265         if (strstr (answer, "assword")) {
 266
 267             /* Currently, this does not work. ssh reads passwords from
 268                /dev/tty, not from stdin :-(. */
 269
 270             message (D_ERROR, MSG_ERROR,
 271                      _
 272                      ("Sorry, we cannot do password authenticated connections for now."));
 273             ERRNOR (EPERM, -1);
 274             if (!SUP.password) {
 275                 char *p, *op;
 276                 p = g_strconcat (_(" fish: Password required for "),
 277                                  SUP.user, " ", (char *) NULL);
 278                 op = vfs_get_password (p);
 279                 g_free (p);
 280                 if (op == NULL)
 281                     ERRNOR (EPERM, -1);
 282                 SUP.password = op;
 283             }
 284             print_vfs_message (_("fish: Sending password..."));
 285             write (SUP.sockw, SUP.password, strlen (SUP.password));
 286             write (SUP.sockw, "\n", 1);
 287         }
 288     }
 289
 290     print_vfs_message (_("fish: Sending initial line..."));
 291     /*
 292      * Run `start_fish_server'. If it doesn't exist - no problem,
 293      * we'll talk directly to the shell.
 294      */
 295     if (fish_command
 296         (me, super, WAIT_REPLY,
 297          "#FISH\necho; start_fish_server 2>&1; echo '### 200'\n") !=
 298         COMPLETE)
 299         ERRNOR (E_PROTO, -1);
 300
 301     print_vfs_message (_("fish: Handshaking version..."));
 302     if (fish_command
 303         (me, super, WAIT_REPLY,
 304          "#VER 0.0.0\necho '### 000'\n") != COMPLETE)
 305         ERRNOR (E_PROTO, -1);
 306
 307     /* Set up remote locale to C, otherwise dates cannot be recognized */
 308     if (fish_command
 309         (me, super, WAIT_REPLY,
 310          "LANG=C; LC_ALL=C; LC_TIME=C\n"
 311          "export LANG; export LC_ALL; export LC_TIME\n" "echo '### 200'\n")
 312         != COMPLETE)
 313         ERRNOR (E_PROTO, -1);
 314
 315     print_vfs_message (_("fish: Setting up current directory..."));
 316     SUP.cwdir = fish_getcwd (me, super);
 317     print_vfs_message (_("fish: Connected, home %s."), SUP.cwdir);
 318 #if 0
 319     super->name =
 320         g_strconcat ("/#sh:", SUP.user, "@", SUP.host, "/", (char *) NULL);
 321 #endif
 322     super->name = g_strdup (PATH_SEP_STR);
 323
 324     super->root =
 325         vfs_s_new_inode (me, super,
 326                          vfs_s_default_stat (me, S_IFDIR | 0755));
 327     return 0;
 328 }
 329
 330 static int
 331 fish_open_archive (struct vfs_class *me, struct vfs_s_super *super,
 332                    const char *archive_name, char *op)
 333 {
 334     char *host, *user, *password, *p;
 335     int flags;
 336
 337     (void) archive_name;
 338
 339     p = vfs_split_url (strchr (op, ':') + 1, &host, &user, &flags,
 340                        &password, 0, URL_NOSLASH);
 341
 342     g_free (p);
 343
 344     SUP.host = host;
 345     SUP.user = user;
 346     SUP.flags = flags;
 347     if (!strncmp (op, "rsh:", 4))
 348         SUP.flags = FISH_FLAG_RSH;
 349     SUP.cwdir = NULL;
 350     if (password)
 351         SUP.password = password;
 352     return fish_open_archive_int (me, super);
 353 }
 354
 355 static int
 356 fish_archive_same (struct vfs_class *me, struct vfs_s_super *super,
 357                    const char *archive_name, char *op, void *cookie)
 358 {
 359     char *host, *user;
 360     int flags;
 361
 362     (void) me;
 363     (void) archive_name;
 364     (void) cookie;
 365
 366     op = vfs_split_url (strchr (op, ':') + 1, &host, &user, &flags, 0, 0,
 367                         URL_NOSLASH);
 368
 369     g_free (op);
 370
 371     flags = ((strcmp (host, SUP.host) == 0)
 372              && (strcmp (user, SUP.user) == 0) && (flags == SUP.flags));
 373     g_free (host);
 374     g_free (user);
 375
 376     return flags;
 377 }
 378
 379 static int
 380 fish_dir_load(struct vfs_class *me, struct vfs_s_inode *dir, char *remote_path)
 381 {
 382     struct vfs_s_super *super = dir->super;
 383     char buffer[8192];
 384     struct vfs_s_entry *ent = NULL;
 385     FILE *logfile;
 386     char *quoted_path;
 387     int reply_code;
 388     gchar *shell_commands;
 389
 390 #if 0
 391     /*
 392      * Simple FISH debug interface :]
 393      */
 394     if (!(MEDATA->logfile))
 395     {
 396         MEDATA->logfile = fopen("/tmp/mc-FISH.sh", "w");
 397     }
 398 #endif /* 0 */
 399
 400     logfile = MEDATA->logfile;
 401
 402     print_vfs_message(_("fish: Reading directory %s..."), remote_path);
 403
 404     gettimeofday(&dir->timestamp, NULL);
 405     dir->timestamp.tv_sec += fish_directory_timeout;
 406     quoted_path = strutils_shell_escape (remote_path);
 407     shell_commands = g_strconcat(
 408                 "#LIST /%s\n"
 409                 "if `perl -v > /dev/null 2>&1` ; then\n"
 410                   "perl -e '\n"
 411                    "use strict;\n"
 412                    "use POSIX;\n"
 413                    "use Fcntl;\n"
 414                    "use POSIX \":fcntl_h\"; #S_ISLNK was here until 5.6\n"
 415                    "import Fcntl \":mode\" unless defined &S_ISLNK; #and is now here\n"
 416                    "my $dirname = $ARGV[0];\n"
 417                    "if (opendir ( DIR, $dirname )) {\n"
 418                    "while( (my $filename = readdir(DIR))){\n"
 419                    "my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks) = lstat(\"$dirname/$filename\");\n"
 420                    "my $mloctime= strftime(\"%%m-%%d-%%Y %%H:%%M\", localtime $mtime);\n"
 421         ,
 422                    "my $strutils_shell_escape_regex= s/([;<>\\*\\|`&\\$!#\\(\\)\\[\\]\\{\\}:'\\''\"\\ \\\\])/\\\\$1/g;\n"
 423                    "my $e_filename = $filename;\n"
 424                    "$e_filename =~ $strutils_shell_escape_regex;\n"
 425                    "if (S_ISLNK($mode) ) {\n"
 426                    "my $linkname = readlink (\"$dirname/$filename\");\n"
 427                    "$linkname =~ $strutils_shell_escape_regex;\n"
 428                    "\n"
 429                           "printf(\"R%%o %%o $uid.$gid\\n"
 430                                     "S$size\\n"
 431                                     "d$mloctime\\n"
 432                                     ":\\\"$e_filename\\\" -> \\\"$linkname\\\"\\n"
 433                                     "\\n\", S_IMODE($mode), S_IFMT($mode));\n"
 434                    "} else {\n"
 435                           "printf(\"R%%o %%o $uid.$gid\\n"
 436                                     "S$size\\n"
 437                                     "d$mloctime\\n"
 438                                     ":\\\"$e_filename\\\"\\n"
 439                                     "\\n\", S_IMODE($mode), S_IFMT($mode));\n"
 440                    "}}\n"
 441         ,
 442                    "printf(\"### 200\\n\");\n"
 443                    "closedir(DIR);\n"
 444                    "} else {\n"
 445                     "printf(\"### 500\\n\");\n"
 446                    "}\n"
 447                    "exit 0\n"
 448                    "' /%s ||\n" /* ARGV[0] - path to browse */
 449                    "    echo '### 500'\n" /* do not hang if perl is to eval it */
 450                 "elif `ls -1 /%s >/dev/null 2>&1` ; then\n"
 451                   "if `ls -Q /%s >/dev/null 2>&1`; then\n"
 452                           "LSOPT=\"-Qlan\";\n"
 453                           "ADD=0;\n"
 454                   "else\n"
 455                           "LSOPT=\"-lan\";\n"
 456                           "ADD=1;\n"
 457                   "fi\n"
 458                   "ls $LSOPT /%s 2>/dev/null | grep '^[^cbt]' | (\n"
 459                           "while read p l u g s m d y n n2 n3; do\n"
 460                                   "if test \"$m\" = \"0\" ; then \n"
 461                                           "s=$d; m=$y; d=$n y=$n2; n=$n3\n"
 462                                   "else\n"
 463                                           "n=$n\" \"$n2\" \"n3\n"
 464                                   "fi\n"
 465                                   "if [ $ADD  = 0 ]; then\n"
 466                                           "echo \"P$p $u.$g\nS$s\nd$m $d $y\n:$n\n\"\n"
 467                                   "elif `sed --version >/dev/null 2>&1` ; then\n"
 468                                           "file=`echo $n | sed -e 's#^\\(.*\\) -> \\(.*\\)#\\1\" -> \"\\2#'`\n"
 469         ,
 470                                           "echo \"P$p $u $g\nS$s\nd$m $d $y\n:\"$file\"\n\"\n"
 471                                   "else\n"
 472                                           "echo \"P$p $u $g\nS$s\nd$m $d $y\n:\"$n\"\n\"\n"
 473                                   "fi\n"
 474                           "done )\n"
 475                   "ls $LSOPT /%s 2>/dev/null | grep '^[cb]' | (\n"
 476                           "while read p l u g a i m d y n n2 n3; do\n"
 477                                   "if test \"$a\" = \"0\" ; then \n"
 478                                           "a=$m; i=$d; m=$y; d=$n y=$n2; n=$n3\n"
 479                                   "else\n"
 480                                           "n=$n\" \"$n2\" \"n3\n"
 481                                   "fi\n"
 482                                   "if [ $ADD = 0 ]; then\n"
 483                                           "echo \"P$p $u.$g\nE$a$i\nd$m $d $y\n:$n\n\"\n"
 484                                   "elif `sed --version >/dev/null 2>&1` ; then\n"
 485                                           "file=`echo $n | sed -e 's#^\\(.*\\) -> \\(.*\\)#\\1\" -> \"\\2#'`\n"
 486                                           "echo \"P$p $u $g\nS$s\nd$m $d $y\n:\"$file\"\n\"\n"
 487                                   "else\n"
 488                                           "echo \"P$p $u $g\nS$s\nd$m $d $y\n:\"$n\"\n\"\n"
 489                                   "fi\n"
 490                           "done)\n"
 491                   "echo '### 200'\n"
 492         "else\n"
 493                   "echo '### 500'\n"
 494         "fi\n"
 495         ,
 496         NULL
 497     );
 498
 499     fish_command (me, super, NONE, shell_commands,
 500             quoted_path, quoted_path, quoted_path, quoted_path, quoted_path, quoted_path);
 501
 502     g_free(shell_commands);
 503     g_free (quoted_path);
 504     ent = vfs_s_generate_entry(me, NULL, dir, 0);
 505     while (1) {
 506         int res = vfs_s_get_line_interruptible (me, buffer, sizeof (buffer), SUP.sockr);
 507         if ((!res) || (res == EINTR)) {
 508             vfs_s_free_entry(me, ent);
 509             me->verrno = ECONNRESET;
 510             goto error;
 511         }
 512         if (logfile) {
 513             fputs (buffer, logfile);
 514             fputs ("\n", logfile);
 515             fflush (logfile);
 516         }
 517         if (!strncmp(buffer, "### ", 4))
 518             break;
 519         if ((!buffer[0])) {
 520             if (ent->name) {
 521                 vfs_s_insert_entry(me, dir, ent);
 522                 ent = vfs_s_generate_entry(me, NULL, dir, 0);
 523             }
 524             continue;
 525         }
 526
 527 #define ST ent->ino->st
 528
 529         switch(buffer[0]) {
 530         case ':': {
 531             char *temp;
 532             char *data_start = buffer+1;
 533             char *filename = data_start;
 534             char *linkname = data_start;
 535             char *filename_bound = filename + strlen(filename);
 536             char *linkname_bound = filename_bound;
 537             if (!strcmp(data_start, "\".\"") || !strcmp(data_start, "\"..\""))
 538                         break;  /* We'll do "." and ".." ourselves */
 539
 540                 if (S_ISLNK(ST.st_mode)) {
 541                         /* we expect: "escaped-name" -> "escaped-name"
 542                         //     -> cannot occur in filenames,
 543                         //     because it will be escaped to -\> */
 544
 545                         if (*filename == '"')
 546                                 ++filename;
 547
 548                         linkname = strstr(filename, "\" -> \"");
 549                         if (!linkname)
 550                         {
 551                                 /* broken client, or smth goes wrong */
 552                                 linkname = filename_bound;
 553                                 if (filename_bound > filename
 554                                     && *(filename_bound - 1) == '"')
 555                                         --filename_bound; /* skip trailing " */
 556                         }
 557                         else
 558                         {
 559                                 filename_bound = linkname;
 560                                 linkname += 6; /* strlen ("\" -> \"") */
 561                                 if (*(linkname_bound - 1) == '"')
 562                                         --linkname_bound; /* skip trailing " */
 563                         }
 564
 565                         ent->name = str_dup_range(filename, filename_bound);
 566                         temp = ent->name;
 567                         ent->name = strutils_shell_unescape(ent->name);
 568                         g_free(temp);
 569
 570                         ent->ino->linkname = str_dup_range(linkname, linkname_bound);
 571                         temp = ent->ino->linkname;
 572                         ent->ino->linkname = strutils_shell_unescape(ent->ino->linkname);
 573                         g_free(temp);
 574                 } else {
 575                         /* we expect: "escaped-name" */
 576                         if (filename_bound - filename > 2)
 577                         {
 578                                 /*
 579                                  there is at least 2 "
 580                                  and we skip them
 581                                 */
 582                                 if (*filename == '"')
 583                                         ++filename;
 584                                 if (*(filename_bound - 1) == '"')
 585                                         --filename_bound;
 586                         }
 587                         ent->name = str_dup_range(filename, filename_bound);
 588                         temp = ent->name;
 589                         ent->name = strutils_shell_unescape(ent->name);
 590                         g_free(temp);
 591                 }
 592                 break;
 593         }
 594         case 'S':
 595 #ifdef HAVE_ATOLL
 596             ST.st_size = (off_t) atoll (buffer+1);
 597 #else
 598             ST.st_size = (off_t) atof (buffer+1);
 599 #endif
 600             break;
 601         case 'P': {
 602             size_t skipped;
 603             vfs_parse_filemode (buffer + 1, &skipped, &ST.st_mode);
 604             break;
 605         }
 606         case 'R': {
 607             /*
 608                raw filemode:
 609                we expect: Roctal-filemode octal-filetype uid.gid
 610             */
 611             size_t skipped;
 612             vfs_parse_raw_filemode (buffer + 1, &skipped, &ST.st_mode);
 613             break;
 614         }
 615         case 'd': {
 616                       vfs_split_text(buffer+1);
 617                       if (!vfs_parse_filedate(0, &ST.st_ctime))
 618                           break;
 619                       ST.st_atime = ST.st_mtime = ST.st_ctime;
 620                   }
 621                   break;
 622         case 'D': {
 623                       struct tm tim;
 624                       if (sscanf(buffer+1, "%d %d %d %d %d %d", &tim.tm_year, &tim.tm_mon,
 625                                  &tim.tm_mday, &tim.tm_hour, &tim.tm_min, &tim.tm_sec) != 6)
 626                           break;
 627                       ST.st_atime = ST.st_mtime = ST.st_ctime = mktime(&tim);
 628                   }
 629                   break;
 630         case 'E': {
 631                       int maj, min;
 632                       if (sscanf(buffer+1, "%d,%d", &maj, &min) != 2)
 633                           break;
 634 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 635                       ST.st_rdev = makedev (maj, min);
 636 #endif
 637                   }
 638         }
 639     }
 640
 641     vfs_s_free_entry (me, ent);
 642     reply_code = fish_decode_reply(buffer + 4, 0);
 643     if (reply_code == COMPLETE) {
 644         g_free (SUP.cwdir);
 645         SUP.cwdir = g_strdup (remote_path);
 646         print_vfs_message (_("%s: done."), me->name);
 647         return 0;
 648     } else if (reply_code == ERROR) {
 649         me->verrno = EACCES;
 650     } else {
 651         me->verrno = E_REMOTE;
 652     }
 653
 654 error:
 655     print_vfs_message (_("%s: failure"), me->name);
 656     return -1;
 657 }
 658
 659 static int
 660 fish_file_store(struct vfs_class *me, struct vfs_s_fh *fh, char *name, char *localname)
 661 {
 662     struct vfs_s_super *super = FH_SUPER;
 663     int n, total;
 664     char buffer[8192];
 665     struct stat s;
 666     int was_error = 0;
 667     int h;
 668     char *quoted_name;
 669
 670     h = open (localname, O_RDONLY);
 671
 672     if (h == -1)
 673         ERRNOR (EIO, -1);
 674     if (fstat(h, &s)<0) {
 675         close (h);
 676         ERRNOR (EIO, -1);
 677     }
 678
 679     /* First, try this as stor:
 680      *
 681      *     ( head -c number ) | ( cat > file; cat >/dev/null )
 682      *
 683      *  If `head' is not present on the remote system, `dd' will be used.
 684      * Unfortunately, we cannot trust most non-GNU `head' implementations
 685      * even if `-c' options is supported. Therefore, we separate GNU head
 686      * (and other modern heads?) using `-q' and `-' . This causes another
 687      * implementations to fail (because of "incorrect options").
 688      *
 689      *  Fallback is:
 690      *
 691      *     rest=<number>
 692      *     while [ $rest -gt 0 ]
 693      *     do
 694      *        cnt=`expr \( $rest + 255 \) / 256`
 695      *        n=`dd bs=256 count=$cnt | tee -a <target_file> | wc -c`
 696      *        rest=`expr $rest - $n`
 697      *     done
 698      *
 699      *  `dd' was not designed for full filling of input buffers,
 700      *  and does not report exact number of bytes (not blocks).
 701      *  Therefore a more complex shell script is needed.
 702      *
 703      *   On some systems non-GNU head writes "Usage:" error report to stdout
 704      *  instead of stderr. It makes impossible the use of "head || dd"
 705      *  algorithm for file appending case, therefore just "dd" is used for it.
 706      */
 707
 708     quoted_name = strutils_shell_escape(name);
 709     print_vfs_message(_("fish: store %s: sending command..."), quoted_name );
 710
 711     /* FIXME: File size is limited to ULONG_MAX */
 712     if (!fh->u.fish.append)
 713         n = fish_command (me, super, WAIT_REPLY,
 714                  "#STOR %lu /%s\n"
 715                  "echo '### 001'\n"
 716                  "file=/%s\n"
 717                  "res=`exec 3>&1\n"
 718                  "(\n"
 719                    "head -c %lu -q - || echo DD >&3\n"
 720                  ") 2>/dev/null | (\n"
 721                    "cat > $file\n"
 722                    "cat > /dev/null\n"
 723                  ")`; [ \"$res\" = DD ] && {\n"
 724                         "> \"$file\"\n"
 725                         "rest=%lu\n"
 726                         "while [ $rest -gt 0 ]\n"
 727                         "do\n"
 728                         "    cnt=`expr \\( $rest + 255 \\) / 256`\n"
 729                         "    n=`dd bs=256 count=$cnt | tee -a \"$file\" | wc -c`\n"
 730                         "    rest=`expr $rest - $n`\n"
 731                         "done\n"
 732                  "}; echo '### 200'\n",
 733                  (unsigned long) s.st_size, quoted_name,
 734                  quoted_name, (unsigned long) s.st_size,
 735                  (unsigned long) s.st_size);
 736     else
 737         n = fish_command (me, super, WAIT_REPLY,
 738                  "#STOR %lu /%s\n"
 739                  "echo '### 001'\n"
 740                  "{\n"
 741                         "file=/%s\n"
 742                         "rest=%lu\n"
 743                         "while [ $rest -gt 0 ]\n"
 744                         "do\n"
 745                         "    cnt=`expr \\( $rest + 255 \\) / 256`\n"
 746                         "    n=`dd bs=256 count=$cnt | tee -a $file | wc -c`\n"
 747                         "    rest=`expr $rest - $n`\n"
 748                         "done\n"
 749                  "}; echo '### 200'\n",
 750                  (unsigned long) s.st_size, quoted_name,
 751                  quoted_name, (unsigned long) s.st_size);
 752
 753     if (n != PRELIM) {
 754         close (h);
 755         ERRNOR(E_REMOTE, -1);
 756     }
 757     total = 0;
 758
 759     while (1) {
 760         int t;
 761         while ((n = read(h, buffer, sizeof(buffer))) < 0) {
 762             if ((errno == EINTR) && tty_got_interrupt ())
 763                 continue;
 764             print_vfs_message(_("fish: Local read failed, sending zeros") );
 765             close(h);
 766             h = open( "/dev/zero", O_RDONLY );
 767         }
 768         if (n == 0)
 769             break;
 770         if ((t = write (SUP.sockw, buffer, n)) != n) {
 771             if (t == -1) {
 772                 me->verrno = errno;
 773             } else {
 774                 me->verrno = EIO;
 775             }
 776             goto error_return;
 777         }
 778         tty_disable_interrupt_key ();
 779         total += n;
 780         print_vfs_message(_("fish: storing %s %d (%lu)"),
 781                           was_error ? _("zeros") : _("file"), total,
 782                           (unsigned long) s.st_size);
 783     }
 784     close(h);
 785     g_free(quoted_name);
 786     if ((fish_get_reply (me, SUP.sockr, NULL, 0) != COMPLETE) || was_error)
 787         ERRNOR (E_REMOTE, -1);
 788     return 0;
 789 error_return:
 790     close(h);
 791     fish_get_reply(me, SUP.sockr, NULL, 0);
 792     g_free(quoted_name);
 793     return -1;
 794 }
 795
 796 static int
 797 fish_linear_start (struct vfs_class *me, struct vfs_s_fh *fh, off_t offset)
 798 {
 799     char *name;
 800     char *quoted_name;
 801     if (offset)
 802         ERRNOR (E_NOTSUPP, 0);
 803     name = vfs_s_fullpath (me, fh->ino);
 804     if (!name)
 805         return 0;
 806     quoted_name = strutils_shell_escape(name);
 807     fh->u.fish.append = 0;
 808
 809     /*
 810      * Check whether the remote file is readable by using `dd' to copy
 811      * a single byte from the remote file to /dev/null. If `dd' completes
 812      * with exit status of 0 use `cat' to send the file contents to the
 813      * standard output (i.e. over the network).
 814      */
 815     offset = fish_command (me, FH_SUPER, WANT_STRING,
 816                 "#RETR /%s\n"
 817                 "if dd if=/%s of=/dev/null bs=1 count=1 2>/dev/null ;\n"
 818                 "then\n"
 819                 "ls -ln /%s 2>/dev/null | (\n"
 820                   "read p l u g s r\n"
 821                   "echo $s\n"
 822                 ")\n"
 823                 "echo '### 100'\n"
 824                 "cat /%s\n"
 825                 "echo '### 200'\n"
 826                 "else\n"
 827                 "echo '### 500'\n"
 828                 "fi\n",
 829                 quoted_name, quoted_name, quoted_name, quoted_name );
 830     g_free (quoted_name);
 831     if (offset != PRELIM) ERRNOR (E_REMOTE, 0);
 832     fh->linear = LS_LINEAR_OPEN;
 833     fh->u.fish.got = 0;
 834     errno = 0;
 835 #if SIZEOF_OFF_T == SIZEOF_LONG
 836     fh->u.fish.total = strtol (reply_str, NULL, 10);
 837 #else
 838     fh->u.fish.total = strtoll (reply_str, NULL, 10);
 839 #endif
 840     if (errno != 0)
 841         ERRNOR (E_REMOTE, 0);
 842     return 1;
 843 }
 844
 845 static void
 846 fish_linear_abort (struct vfs_class *me, struct vfs_s_fh *fh)
 847 {
 848     struct vfs_s_super *super = FH_SUPER;
 849     char buffer[8192];
 850     int n;
 851
 852     print_vfs_message( _("Aborting transfer...") );
 853     do {
 854         n = MIN(8192, fh->u.fish.total - fh->u.fish.got);
 855         if (n) {
 856             if ((n = read(SUP.sockr, buffer, n)) < 0)
 857                 return;
 858             fh->u.fish.got += n;
 859         }
 860     } while (n);
 861
 862     if (fish_get_reply (me, SUP.sockr, NULL, 0) != COMPLETE)
 863         print_vfs_message( _("Error reported after abort.") );
 864     else
 865         print_vfs_message( _("Aborted transfer would be successful.") );
 866 }
 867
 868 static int
 869 fish_linear_read (struct vfs_class *me, struct vfs_s_fh *fh, void *buf, int len)
 870 {
 871     struct vfs_s_super *super = FH_SUPER;
 872     int n = 0;
 873     len = MIN( fh->u.fish.total - fh->u.fish.got, len );
 874     tty_disable_interrupt_key ();
 875     while (len && ((n = read (SUP.sockr, buf, len))<0)) {
 876         if ((errno == EINTR) && !tty_got_interrupt ())
 877             continue;
 878         break;
 879     }
 880     tty_enable_interrupt_key();
 881
 882     if (n>0) fh->u.fish.got += n;
 883     if (n<0) fish_linear_abort(me, fh);
 884     if ((!n) && ((fish_get_reply (me, SUP.sockr, NULL, 0) != COMPLETE)))
 885         ERRNOR (E_REMOTE, -1);
 886     ERRNOR (errno, n);
 887 }
 888
 889 static void
 890 fish_linear_close (struct vfs_class *me, struct vfs_s_fh *fh)
 891 {
 892     if (fh->u.fish.total != fh->u.fish.got)
 893         fish_linear_abort(me, fh);
 894 }
 895
 896 static int
 897 fish_ctl (void *fh, int ctlop, void *arg)
 898 {
 899     (void) arg;
 900     (void) fh;
 901     (void) ctlop;
 902     return 0;
 903 #if 0
 904     switch (ctlop) {
 905         case VFS_CTL_IS_NOTREADY:
 906             {
 907                 int v;
 908
 909                 if (!FH->linear)
 910                     vfs_die ("You may not do this");
 911                 if (FH->linear == LS_LINEAR_CLOSED || FH->linear == LS_LINEAR_PREOPEN)
 912                     return 0;
 913
 914                 v = vfs_s_select_on_two (FH_SUPER->u.fish.sockr, 0);
 915                 if (((v < 0) && (errno == EINTR)) || v == 0)
 916                     return 1;
 917                 return 0;
 918             }
 919         default:
 920             return 0;
 921     }
 922 #endif
 923 }
 924
 925 static int
 926 fish_send_command(struct vfs_class *me, struct vfs_s_super *super, const char *cmd, int flags)
 927 {
 928     int r;
 929
 930     r = fish_command (me, super, WAIT_REPLY, "%s", cmd);
 931     vfs_stamp_create (&vfs_fish_ops, super);
 932     if (r != COMPLETE) ERRNOR (E_REMOTE, -1);
 933     if (flags & OPT_FLUSH)
 934         vfs_s_invalidate(me, super);
 935     return 0;
 936 }
 937
 938 #define PREFIX \
 939     char buf[BUF_LARGE]; \
 940     const char *crpath; \
 941     char *rpath, *mpath = g_strdup (path); \
 942     struct vfs_s_super *super; \
 943     if (!(crpath = vfs_s_get_path_mangle (me, mpath, &super, 0))) { \
 944         g_free (mpath); \
 945         return -1; \
 946     } \
 947     rpath = strutils_shell_escape(crpath); \
 948     g_free (mpath);
 949
 950 #define POSTFIX(flags) \
 951     g_free (rpath); \
 952     return fish_send_command(me, super, buf, flags);
 953
 954 static int
 955 fish_chmod (struct vfs_class *me, const char *path, int mode)
 956 {
 957     PREFIX
 958     g_snprintf(buf, sizeof(buf), "#CHMOD %4.4o /%s\n"
 959                                  "if chmod %4.4o /%s 2>/dev/null; then\n"
 960                                     "echo '### 000'\n"
 961                                  "else\n"
 962                                     "echo '### 500'\n"
 963                                  "fi\n",
 964             mode & 07777, rpath,
 965             mode & 07777, rpath);
 966     POSTFIX(OPT_FLUSH);
 967 }
 968
 969 #define FISH_OP(name, string) \
 970 static int fish_##name (struct vfs_class *me, const char *path1, const char *path2) \
 971 { \
 972     char buf[BUF_LARGE]; \
 973     const char *crpath1, *crpath2; \
 974     char *rpath1, *rpath2, *mpath1, *mpath2; \
 975     struct vfs_s_super *super1, *super2; \
 976     if (!(crpath1 = vfs_s_get_path_mangle (me, mpath1 = g_strdup(path1), &super1, 0))) { \
 977         g_free (mpath1); \
 978         return -1; \
 979     } \
 980     if (!(crpath2 = vfs_s_get_path_mangle (me, mpath2 = g_strdup(path2), &super2, 0))) { \
 981         g_free (mpath1); \
 982         g_free (mpath2); \
 983         return -1; \
 984     } \
 985     rpath1 = strutils_shell_escape (crpath1); \
 986     g_free (mpath1); \
 987     rpath2 = strutils_shell_escape (crpath2); \
 988     g_free (mpath2); \
 989     g_snprintf(buf, sizeof(buf), string "\n", rpath1, rpath2, rpath1, rpath2); \
 990     g_free (rpath1); \
 991     g_free (rpath2); \
 992     return fish_send_command(me, super2, buf, OPT_FLUSH); \
 993 }
 994
 995 FISH_OP(rename, "#RENAME /%s /%s\n"
 996                 "if mv /%s /%s 2>/dev/null; then\n"
 997                     "echo '### 000'\n"
 998                 "else\n"
 999                     "echo '### 500'\n"
1000                 "fi\n")
1001 FISH_OP(link,   "#LINK /%s /%s\n"
1002                 "if ln /%s /%s 2>/dev/null; then\n"
1003                     "echo '### 000'\n"
1004                 "else\n"
1005                     "echo '### 500'\n"
1006                 "fi\n")
1007
1008 static int fish_symlink (struct vfs_class *me, const char *setto, const char *path)
1009 {
1010     char *qsetto;
1011     PREFIX
1012     qsetto = strutils_shell_escape (setto);
1013     g_snprintf(buf, sizeof(buf),
1014             "#SYMLINK %s /%s\n"
1015             "if ln -s %s /%s 2>/dev/null; then\n"
1016                 "echo '### 000'\n"
1017             "else\n"
1018                 "echo '### 500'\n"
1019             "fi\n",
1020             qsetto, rpath, qsetto, rpath);
1021     g_free (qsetto);
1022     POSTFIX(OPT_FLUSH);
1023 }
1024
1025 static int
1026 fish_chown (struct vfs_class *me, const char *path, int owner, int group)
1027 {
1028     char *sowner, *sgroup;
1029     struct passwd *pw;
1030     struct group *gr;
1031
1032     if ((pw = getpwuid (owner)) == NULL)
1033         return 0;
1034
1035     if ((gr = getgrgid (group)) == NULL)
1036         return 0;
1037
1038     sowner = pw->pw_name;
1039     sgroup = gr->gr_name;
1040     {
1041         PREFIX
1042         g_snprintf (buf, sizeof(buf),
1043             "#CHOWN %s:%s /%s\n"
1044             "if chown %s:%s /%s 2>/dev/null; then\n"
1045                 "echo '### 000'\n"
1046             "else\n"
1047                 "echo '### 500'\n"
1048             "fi\n",
1049             sowner, sgroup, rpath,
1050             sowner, sgroup, rpath);
1051         fish_send_command (me, super, buf, OPT_FLUSH);
1052         /* FIXME: what should we report if chgrp succeeds but chown fails? */
1053         /* fish_send_command(me, super, buf, OPT_FLUSH); */
1054         POSTFIX (OPT_FLUSH)
1055     }
1056 }
1057
1058 static int fish_unlink (struct vfs_class *me, const char *path)
1059 {
1060     PREFIX
1061     g_snprintf(buf, sizeof(buf),
1062             "#DELE /%s\n"
1063             "if rm -f /%s 2>/dev/null; then\n"
1064                 "echo '### 000'\n"
1065             "else\n"
1066                 "echo '### 500'\n"
1067             "fi\n",
1068             rpath, rpath);
1069     POSTFIX(OPT_FLUSH);
1070 }
1071
1072 static int fish_exists (struct vfs_class *me, const char *path)
1073 {
1074     PREFIX
1075
1076     g_snprintf(buf, sizeof(buf),
1077             "#ISEXISTS /%s\n"
1078             "ls -l /%s >/dev/null 2>/dev/null\n"
1079             "echo '### '$?\n",
1080             rpath, rpath);
1081
1082     g_free (rpath);
1083
1084     if ( fish_send_command(me, super, buf, OPT_FLUSH) == 0 )
1085         return 1;
1086
1087     return 0;
1088 }
1089
1090
1091 static int fish_mkdir (struct vfs_class *me, const char *path, mode_t mode)
1092 {
1093     int ret_code;
1094
1095     PREFIX
1096
1097     (void) mode;
1098
1099     g_snprintf(buf, sizeof(buf),
1100             "#MKD /%s\n"
1101             "if mkdir /%s 2>/dev/null; then\n"
1102                 "echo '### 000'\n"
1103             "else\n"
1104                 "echo '### 500'\n"
1105             "fi\n",
1106             rpath, rpath);
1107
1108     g_free (rpath);
1109     ret_code = fish_send_command(me, super, buf, OPT_FLUSH);
1110
1111     if ( ret_code != 0 )
1112         return ret_code;
1113
1114     if ( ! fish_exists (me, path) ){
1115         ERRNOR (EACCES, -1);
1116     }
1117     return 0;
1118 }
1119
1120 static int fish_rmdir (struct vfs_class *me, const char *path)
1121 {
1122     PREFIX
1123     g_snprintf(buf, sizeof(buf),
1124             "#RMD /%s\n"
1125             "if rmdir /%s 2>/dev/null; then\n"
1126                 "echo '### 000'\n"
1127             "else\n"
1128                 "echo '### 500'\n"
1129             "fi\n",
1130             rpath, rpath);
1131     POSTFIX(OPT_FLUSH);
1132 }
1133
1134 static int
1135 fish_fh_open (struct vfs_class *me, struct vfs_s_fh *fh, int flags,
1136               int mode)
1137 {
1138     (void) mode;
1139
1140     fh->u.fish.append = 0;
1141     /* File will be written only, so no need to retrieve it */
1142     if (((flags & O_WRONLY) == O_WRONLY) && !(flags & (O_RDONLY | O_RDWR))) {
1143         fh->u.fish.append = flags & O_APPEND;
1144         if (!fh->ino->localname) {
1145             int tmp_handle =
1146                 vfs_mkstemps (&fh->ino->localname, me->name,
1147                               fh->ino->ent->name);
1148             if (tmp_handle == -1)
1149                 return -1;
1150             close (tmp_handle);
1151         }
1152         return 0;
1153     }
1154     if (!fh->ino->localname)
1155         if (vfs_s_retrieve_file (me, fh->ino) == -1)
1156             return -1;
1157     if (!fh->ino->localname)
1158         vfs_die ("retrieve_file failed to fill in localname");
1159     return 0;
1160 }
1161
1162 static void
1163 fish_fill_names (struct vfs_class *me, fill_names_f func)
1164 {
1165     struct vfs_s_super *super = MEDATA->supers;
1166     char *name;
1167
1168     char gbuf[10];
1169
1170     while (super)
1171     {
1172         const char *flags = "";
1173         switch (SUP.flags)
1174         {
1175             case FISH_FLAG_RSH:
1176                 flags = ":r";
1177                 break;
1178             case FISH_FLAG_COMPRESSED:
1179                 flags = ":C";
1180                 break;
1181             default:
1182                 if (SUP.flags > FISH_FLAG_RSH)
1183                 {
1184                     break;
1185                     g_snprintf (gbuf, sizeof (gbuf), ":%d", SUP.flags);
1186                     flags = gbuf;
1187                 }
1188                 break;
1189         }
1190
1191         name = g_strconcat ("/#sh:", SUP.user, "@", SUP.host, flags,
1192                             "/", SUP.cwdir, (char *) NULL);
1193         (*func)(name);
1194         g_free (name);
1195         super = super->next;
1196     }
1197 }
1198
1199 static void *
1200 fish_open (struct vfs_class *me, const char *file, int flags, int mode)
1201 {
1202     /*
1203       sorry, i've places hack here
1204       cause fish don't able to open files with O_EXCL flag
1205     */
1206     flags &= ~O_EXCL;
1207     return vfs_s_open (me, file, flags, mode);
1208 }
1209
1210
1211 void
1212 init_fish (void)
1213 {
1214     static struct vfs_s_subclass fish_subclass;
1215
1216     fish_subclass.flags = VFS_S_REMOTE;
1217     fish_subclass.archive_same = fish_archive_same;
1218     fish_subclass.open_archive = fish_open_archive;
1219     fish_subclass.free_archive = fish_free_archive;
1220     fish_subclass.fh_open = fish_fh_open;
1221     fish_subclass.dir_load = fish_dir_load;
1222     fish_subclass.file_store = fish_file_store;
1223     fish_subclass.linear_start = fish_linear_start;
1224     fish_subclass.linear_read = fish_linear_read;
1225     fish_subclass.linear_close = fish_linear_close;
1226
1227     vfs_s_init_class (&vfs_fish_ops, &fish_subclass);
1228     vfs_fish_ops.name = "fish";
1229     vfs_fish_ops.prefix = "sh:";
1230     vfs_fish_ops.fill_names = fish_fill_names;
1231     vfs_fish_ops.chmod = fish_chmod;
1232     vfs_fish_ops.chown = fish_chown;
1233     vfs_fish_ops.open = fish_open;
1234     vfs_fish_ops.symlink = fish_symlink;
1235     vfs_fish_ops.link = fish_link;
1236     vfs_fish_ops.unlink = fish_unlink;
1237     vfs_fish_ops.rename = fish_rename;
1238     vfs_fish_ops.mkdir = fish_mkdir;
1239     vfs_fish_ops.rmdir = fish_rmdir;
1240     vfs_fish_ops.ctl = fish_ctl;
1241     vfs_register_class (&vfs_fish_ops);
1242 }